Air-heater.



No. 874,673.. PETENTED DEG. 24, 19o?.

E. W. GREEN. AIE EEETEE.

APPLICATION FILED JAN.11', 1907.

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' yinsure FRANCIS WILLIAM GREEN,

PATENT omnes.

oF WAKEFIELD, ENGLAND.A

AIR-HEATER.

Specification of Letters Patent.

. A Patented Dec. 241,1907.

Application filed J' auuary 17719D7 Serial No. 352,799.

To all whom fit may concern:

Be it known that FRANCIS WILLIAM GREEN, a subject of the King of Great; Britain, residing at Eeonomiser Werks, VVkefield, Yorkb shire, England, has invented certain new and useful Improvements in Air-Heaters, of which the follov. ing is a specification.

In one off the ordinary types of heater, .the

air to be heated passes inside the tubes, re-

ceiving heat by contact with the inside surfaces of the tubes, which in turn' receive heat from the usual source. I

Airis heated by conjactonly and the present invention consists of ings orvanes or other devices arranged er iitted on a spiral inside of each tube of i he heater, the ings or vanes delecimg the air on te the lnside surface of the pipe. These ings can be of any angle or bent io any angle, which may be found desirable for the efficient vorking of the heaier. The spiral moion brings the air into contact vtiih a larger heatinfr surface, and the ings split the air up an( increase The efficiency of the heater.

My invention r. ill be clearly underseood. irem the following descripion aided by the aemnpanying draumgsin which i" Ifi'gurel -is a lOngi-udinalseciion of an air tube 1 of an air lleier, such tube being consohnecied to the top'bOX 2 and bottom box 3, a

series forming' uitll a iop box and bottom box a section of a healer, any number of such sections being connected together by their top and bottom boxes to form a complete apparatus Whiclris preferably situalein a flue or chimney running from a furnace, the heat from which plays around the outside of the tubes of the heater on its way 'lo the outlet. Fig. 2 is a section through the lince b of Fig. 3 is an elevation of'a section of a heater.

According to my invention, I forma s iral which I t or suspend by a T piece 5 een- I nected te one .end of the spiral inside each pipe 1 of the heater, and on this spiral 4, I

6 se shaped, ositioned or bent that they split up the air which flows spirally up ordoa n the ltube and constantly deiect it' on to the inside surface of the pipe, whereby a greaer heat is` imparted to the air than would ocheraise be obtained by it simply passing through the pipe in a spiral or other manner.

What I claim and desire te secure by Letters Patent is:-

1. A heaerof the class described comprising a pipe forming a passage-Way therethrough, a spiral member arranged Wi-hin the pipe and extending throughout the longitudinal extent thereof, and laterally extending u ings v. ith respect to the longitudinal extent of the pipe projecting from said spiral member u ithin the latter and adapted te defleet: the heat passing through the pipe intermediaf e the said' spiral and the inner wall of the latter to cause said heat to be dispersed against said inner wall.

2. In combination u ith a plurality of heaing tubes, of spiral members within said tubes and extending throughout the lengitudinal extent thereof, a T-element secured to one end of each spiral member and in fric* tional coniact with the piping at one eX- tremiiy thereof for suspending said spiral members within the pipes, and a plurality of u ings secured to said spiral members and extending laterally therefrom with respect to the longitudinal extent of the tubes.

In testimony whereof I have hereunto se*U` my hand in preseneeof two subscribing WiL-- nesses.

FRANCIS WILLIAM GREEN.

Witnesses HARRY KENYON,

W. B. GREENER.

rivet, form or otherwise apply Wings or vanes 

